Hello,
It is actually quite easy to migrate previously archived data to ILM. Once your ILM Audit area has the relative archive object and there is an IRM policy associated to the archive object - all you then need to do is to go into
SARA -> Management, select the archive session to be migrated, right click on it and select File Conversion.
I am not able to answer the unstructured data migration as I have not done that before.
Best Regards,
Karin Tillotson